Abstract: In the present study, the hollow bauxite proppant with controlled inner-hollow structure was prepared by templates method with the urea and MnO2 as well as the bauxite powder used as pore forming template, sintering additives and spherical shell coating material, respectively.The change of the mineral facies composition and chemical component of the raw material before and after vsintering were analysed by X-ray fluorescence, the TG-DSC, XRD and SEM.The SEM was used to observe the variation in microtopography of the ceramic proppant.The influence of pretreatment on the microstructure and properties of the as-received hollow bauxite proppant was investigated,and the influence mechanism is analyzed.The results show that the pretreatment of calcining the raw material powder contributed to improve the strength of proppant.After sinter at 1440 ℃, the main phase constitution of the as-prepared sample is mullite phase and corundum phase.Meanwhile, the volume density of the hollow proppant manufactured by lightly calcined bauxice is 1.35 g·cm-3, the apparent density is 2.47 g·cm-3, the breakage rate is 5.21; at the closure pressure of 25 MPa, and the average value of the compression resistance for single grain is 58 N.The sample quality is stable and the productive process is easily controlled.

Key words: In the present study, the hollow bauxite proppant with controlled inner-hollow structure was prepared by templates method with the urea and MnO2 as well as the bauxite powder used as pore forming template, sintering additives and spherical shell coating material, respectively.The change of the mineral facies composition and chemical component of the raw material before and after vsintering were analysed by X-ray fluorescence, the TG-DSC, XRD and SEM.The SEM was used to observe the variation in microtopography of the ceramic proppant.The influence of pretreatment on the microstructure and properties of the as-received hollow bauxite proppant was investigated,and the influence mechanism is analyzed.The results show that the pretreatment of calcining the raw material powder contributed to improve the strength of proppant.After sinter at 1440 ℃, the main phase constitution of the as-prepared sample is mullite phase and corundum phase.Meanwhile, the volume density of the hollow proppant manufactured by lightly calcined bauxice is 1.35 g·cm-3, the apparent density is 2.47 g·cm-3, the breakage rate is 5.21; at the closure pressure of 25 MPa, and the average value of the compression resistance for single grain is 58 N.The sample quality is stable and the productive process is easily controlled.